you have no technology and new ways to look at photographs and the film that happened from there. in the documentary what do we learn that we didn't know before about how this sneak aattack was carried out? >> we learned things that speak to the essence of what happened. for example, in the famous footage that captures the death of the battleship "uss arizona." the explosion created a tidal wave that washed up and washed over ford island. we can see, for example, that the concussion was so great from the explosion of the arizona that it forced soot and coal dust out of the ship next to it. we get things like that that speak for the intensity of the experience of what was going on. in addition to that, the new examination of this footage, the stabilization of previously bouncy handheld footage tells interesting things bu how they carried out the attack, how successful the japanese were tactically. in addition to revealing texture to december 7, 1941 we haven't seen in its full glory before. >> as a historian can you talk about how it changed america to be attacked on its own soil f